Description

This reinforced gearbox designed for use with 7mm bearings/bushings. Fits M4A1, M4RIS, M16A2, SR16-M4 and S-System. Super strong alloy with all the necessary screws and even a hex wrench to make installation easy! Refined non-stick anodized finish means the gearbox is easy to keep clean and grease-free for maintenance! Same mechabox case as used on the expensive complete Systema M150, M170 mechaboxes!